diff options
Diffstat (limited to 'src/app/transactiontest/util.S')
| -rw-r--r-- | src/app/transactiontest/util.S | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/app/transactiontest/util.S b/src/app/transactiontest/util.S index 1a12736..ea298b6 100644 --- a/src/app/transactiontest/util.S +++ b/src/app/transactiontest/util.S @@ -6,6 +6,7 @@ #define SRAM_SIZE 4096 ; SRAM and stack pointer backup space +; two backup areas allow for consistency in case of a power loss during backup sp_backup1: .space 2 sram_backup1: @@ -20,7 +21,8 @@ sram_backup2: backup_cookie: .space 2 -; save entire SRAM and CPU register state to persistent FRAM +; save entire SRAM and CPU register state to persistent FRAM. +; Must be called with interrupts disabled asm_save_all: ; r4 to r11 are callee saved -> push them to the stack. @@ -65,9 +67,8 @@ save_sram_word: ; load entire SRAM and CPU register state from persistent FRAM, ; if it contains valid backup data. Execution will resume at the -; last place where asm_save_all() was called is if nothing in between -; had happened. Does not take possible the state of hardware peripherals -; into account. +; last place where asm_save_all() was called as if nothing in between +; had happened. Does not take the state of hardware peripherals into account. asm_load_all: ; check if we have backup data |